In response to the Barrett Tryon case, the National Labor Relations Board asserted that the following social media policy provisions are unlawful:
a) "Avoid harming the image and integrity of the company."
b) "Do not express public opinions about the workplace, work satisfaction or dissatisfaction, wages, hours or work conditions."
c) "Don't comment on any legal matters, including pending litigation or disputes."
d) What is the fourth item?